EP0195392A2 - Horizontal deflection circuit - Google Patents
Horizontal deflection circuit Download PDFInfo
- Publication number
- EP0195392A2 EP0195392A2 EP86103513A EP86103513A EP0195392A2 EP 0195392 A2 EP0195392 A2 EP 0195392A2 EP 86103513 A EP86103513 A EP 86103513A EP 86103513 A EP86103513 A EP 86103513A EP 0195392 A2 EP0195392 A2 EP 0195392A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage
- capacitor
- horizontal deflection
- deflection circuit
- transistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 19
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 5
- 230000001419 dependent effect Effects 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/22—Circuits for controlling dimensions, shape or centering of picture on screen
- H04N3/23—Distortion correction, e.g. for pincushion distortion correction, S-correction
- H04N3/233—Distortion correction, e.g. for pincushion distortion correction, S-correction using active elements
Definitions
- the invention relates to a horizontal drop circuit according to the preamble of claim 1.
- a deflection circuit with raster correction for cathode ray tubes is known.
- a second voltage source is temporarily coupled to the deflection generator of the deflection circuit, which effects a raster correction.
- the coupling of the second voltage source is controllable and the control takes place via one of them vertical frequency voltage influenced pulse width modulator. This is to eliminate distortion in the east / west direction on the cathode ray tube.
- the invention has for its object to provide a horizontal deflection with raster correction for a cathode ray tube, which has a simpler circuit structure.
- a charging coil LS is connected to the connection point of the deflection coil AS with the forward capacitor Cyist, the other connection of which is connected to the positive operating voltage + U A.
- the base of transistor T 1 is connected to an oscillator G, which generates a horizontal frequency voltage. This horizontal frequency voltage is synchronized via a synchronous voltage applied to terminal C.
- the connection point of the forward capacitor Cy with the return capacitor C R and with the bidirectional switch is referred to as the base point A.
- This base point A is connected to the zero potential via an NPN transistor T2. From base A, a capacitor C 1 is still connected to the zero potential. Through this capacitor C1, the base point A is directly at the zero potential in terms of AC voltage, while its DC voltage level is influenced by the transistor T2.
- the base of the transistor T2 is connected to the output B of a control amplifier OP.
- the control voltage U R generated by the control amplifier OP controls the transistor T2 in such a way that the desired raster correction and image width is achieved.
- the vertical frequency voltage Uv is applied to the control amplifier OP in order to compensate for the 0 / W distortion as usual.
- the change in image width that occurs when the beam current changes is avoided by the voltage U 1 .
- volume peaks can lead to such a load on the operating voltage + U A that a change in the width of the picture occurs. That is why the voltage U T is switched on to the control amplifier, which counteracts these changes
- the anode of the diode D2 whose cathode is connected to a capacitor C2 connected to zero potential, is connected to the connection point of the deflection coil AS with the return capacitor C R.
- a DC voltage is obtained from the return pulses present on the deflection coil AS, which serves on the one hand as a voltage U G2 for the second grid of the cathode ray tube and on the other hand via the resistor R as a voltage U to the control amplifier OP
- the height of the recovery pulses at the deflection coil AS corresponds to the image width of the image displayed with the cathode ray tube.
- the voltage U at the control amplifier OP is the actual value of the image width and the control voltage U R is obtained in the control amplifier from the comparison with the reference voltage U Ref . From this it can be seen that a closed control loop is present for the bit width stabilization.
- the further voltages Uv, U, and U T applied to the control amplifier OP control the horizontal deflection in such a way that a constant image width is maintained
- a diode D3 is connected to the base point A with its anode, the cathode of which is connected to a positive voltage + U B.
- This positive voltage + U B can be, for example, 17 volts.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Details Of Television Scanning (AREA)
Abstract
Bei der Horizontal-Ablenkschaltung wird der gemeinsame Fußpunkt (A) des Zweirichtungsschalters (D1, T1), des Hinlauf- (CY) und des Rücklaufkondensators (CR) über einen Transistor (T2) mit dem Nullpotential verbunden. Der Transistor (T2) wird von der Regelspannung (UR) für eine konstante Bildbreite und Rasterkorrektur gesteuert. Dem Transistor (T2) kann ein Kondensator (C1) und eine vorgespannte Diode (D3) parallel geschaltet sein.In the horizontal deflection circuit, the common base point (A) of the bidirectional switch (D1, T1), the forward (CY) and the return capacitor (CR) is connected to the zero potential via a transistor (T2). The transistor (T2) is controlled by the control voltage (UR) for a constant image width and raster correction. A capacitor (C1) and a biased diode (D3) can be connected in parallel to the transistor (T2).
Description
Die Erfindung bezieht sich auf eine Horizonfal-Ablsnkschaltung gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a horizontal drop circuit according to the preamble of claim 1.
Aus der DE-PS 31 26 791 ist eine Ablenkschaltung mit Rasterkorrektur für Kathodenstrahlröhren bekannt Bei dieser Ablenkschaltung wird zeitweise eine zweite Spannungsquelle an den Ablenkgenerator der Ablenkschaltung angekoppelt, die eine Rasterkorrektur bewirkt Die Ankopplung der zweiten Spannungsquelle ist steuerbar und die Steuerung erfolgt über einen von einer vertikalfrequenten Spannung beeinflußten Impulsbreitenmodulator. Damit soll eine Verzeichnung in Ost/West-Richtung auf der Kathodenstrahlröhre beseitigt werden.From DE-PS 31 26 791 a deflection circuit with raster correction for cathode ray tubes is known. In this deflection circuit, a second voltage source is temporarily coupled to the deflection generator of the deflection circuit, which effects a raster correction. The coupling of the second voltage source is controllable and the control takes place via one of them vertical frequency voltage influenced pulse width modulator. This is to eliminate distortion in the east / west direction on the cathode ray tube.
Der Erfindung liegt die Aufgabe zugrunde, eine Horizontal-Ablenkschatiung mit Rasterkorrektur für eine Kathodenstrahlröhre anzugeben, die einen einfacheren Schaltungsaufbau hat.The invention has for its object to provide a horizontal deflection with raster correction for a cathode ray tube, which has a simpler circuit structure.
Die Lösung dieser Aufgabe erfolgt mit den im Anspruch 1 angegebenen Mitteln. Vorteilhafte Ausgestattungen der Erfindung sind in den Unteransprüchen 2 bis 5 enthalten.This object is achieved with the means specified in claim 1. Advantageous configurations of the invention are contained in subclaims 2 to 5.
Die Erfindung wird nun anhand von einem in der Figur gezeigten Ausführungsbeispiel näher ertäufert In der Figur ist schematisch der Stromlaufplan einer Horizontat-Ablenkschaltung dargestelltThe invention will now be baptized in more detail on the basis of an exemplary embodiment shown in the figure. The circuit diagram of a horizontal deflection circuit is shown schematically in the figure
Parallel zu der Reihenschaltung aus der Ablenkspule AS und dem Hinlaufkondensator Cy sind der Rücklautkondensator CR und der Zweirichtungsschalter; bestehend aus einem NPN-Transistor T1 und einer Diode D1,angeordnet An den Verbindungspunkt der Ablenkspule AS mit dem Hinlaufkondensator Cyist eine Ladespule LS angeschlossen, deren anderer Anschluß mit der positiven Betriebsspannung +UA verbunden ist. Die Basis des Transistors T1 ist mit einem Oszillator G verbunden, der eine horizontatfrequente Spannung erzeugt Diese horizontalfrequente Spannung wird über eine an der Klemme C anliegende Synchronspannung synchronisiertParallel to the series connection of the deflection coil AS and the forward capacitor Cy are the back-sounding capacitor C R and the bidirectional switch; Consisting of an NPN transistor T1 and a diode D1, a charging coil LS is connected to the connection point of the deflection coil AS with the forward capacitor Cyist, the other connection of which is connected to the positive operating voltage + U A. The base of transistor T 1 is connected to an oscillator G, which generates a horizontal frequency voltage. This horizontal frequency voltage is synchronized via a synchronous voltage applied to terminal C.
Der Verbindungspunkt des Hinlaufkondensators Cy mit dem Rücklaufkondensator CR und mit dem Zweirichtungsschalter ist als Fußpunkt A bezeichnet Dieser Fußpunkt A ist über einen NPN-Transistor T2 mit dem Nullpotential verbunden. Vom Fußpunkt A ist weiterhin ein Kondensator C1 mit dem Nullpotential verbunden. Durch diesen Kondensator C1 liegt der Fußpunkt A wechselspannungsmäßig direkt auf dem Nullpotential, während sein Gleichspannungsniveau durch den Transistor T2 beeinflußt wird.The connection point of the forward capacitor Cy with the return capacitor C R and with the bidirectional switch is referred to as the base point A. This base point A is connected to the zero potential via an NPN transistor T2. From base A, a capacitor C 1 is still connected to the zero potential. Through this capacitor C1, the base point A is directly at the zero potential in terms of AC voltage, while its DC voltage level is influenced by the transistor T2.
Hierzu ist die Basis des Transistors T2 mit dem Ausgang B eines Regelverstärkers OP verbunden. Die vom Regelverstärker OP erzeugte Regelspannung UR steuert den Transistor T2 derart, daß die gewünschte Rasterkorrektur und Bildbreite erreicht wird.For this purpose, the base of the transistor T2 is connected to the output B of a control amplifier OP. The control voltage U R generated by the control amplifier OP controls the transistor T2 in such a way that the desired raster correction and image width is achieved.
Zur Erzeugung der Regelspannung UR sind an den Regelverstärker OP folgende Spannungen angelegt:
- -die Referenzspannung URef,
- -eine aus den Rücklaufimpulsen gewonnene Gleichspannung U,
- -eine vertikalfrequente Spannung Uv,
- -eine dem Strahlstrom der Kathodenstrahlröhre entsprechende Spannung U1 und
- -eine von der Betriebsspannung der Tonstufe abhängige Spannung UT.
- the reference voltage U Ref ,
- a direct voltage U obtained from the return pulses,
- a vertical frequency voltage U v ,
- a voltage U 1 and corresponding to the beam current of the cathode ray tube
- a voltage U T dependent on the operating voltage of the tone stage.
Die vertikalftequente Spannung Uv wird an den Regelverstärker OP angetegt, um wie üblich die 0/W-Verzeichnung auszugleichen. Die bei sich änderndem Strahlstrom auftretende Bildbreitenänderung wird durch die Spannung U1 vermieden. Bei Tonstufen mit großer Leistung können Lautstärkespitzen zu einer derartigen Belastung der Betriebsspannung +U A führen, daß eine Bifdbreiteriänderung auftritt Deswegen ist die Spannung UT an den Regelverstärker angeschaltet die diesen Änderungen entgegenwirktThe vertical frequency voltage Uv is applied to the control amplifier OP in order to compensate for the 0 / W distortion as usual. The change in image width that occurs when the beam current changes is avoided by the voltage U 1 . In the case of tone stages with high power, volume peaks can lead to such a load on the operating voltage + U A that a change in the width of the picture occurs. That is why the voltage U T is switched on to the control amplifier, which counteracts these changes
Die Gewinnung der Spannungen Uv , U1 und UT ist nicht im einzelnen dargestellt, während die Erzeugung der Spannung U nachfolgend beschrieben ist.The generation of the voltages U v , U 1 and U T is not shown in detail, while the generation of the voltage U is described below.
An den Verbindungspunkt der Ablenkspule AS mit dem Rücklauflcondensator CR ist die Anode der Diode D2 angeschlossen, deren Kathode mit einem gegen Nullpotential geschalteten Kondensator C2 verbunden ist. Mit der Diode D2 und dem Kondensator C2 wird aus den an der Ablenkspule AS vorhandenen Rücklaufimpulsen eine Gleichspannung gewonnen, die zum einen als Spannung UG2 für das zweite Gitter der Kathodenstrahlröhre dient und die zum anderen über den Widerstand R als Spannung U an den Regelverstärker OP gelegt ist Die Höhe der Rückfaufimpulse an der Ablenkspule AS entspricht der Bildbreite des mit der Kathodenstrahlröhre dargestellten Bildes. Entsprechend ist die Spannung U am Regelverstärker OP der istwert der Bildbreite und aus dem Vergleich mit der Referenzspannung URef wird im Regelverstärker die Regelspannung U R gewonnen. Hieraus ist ersichtlich, daß für die Bitdbreitenstabilisierung ein geschlossener Regelkreis vorhanden ist Die weiteren am Regelverstärker OP anliegenden Spannungen Uv, U , und UT steuern die Horizontalablenkung derart, daß eine konstante Bildbreite erhalten bleibtThe anode of the diode D2, whose cathode is connected to a capacitor C2 connected to zero potential, is connected to the connection point of the deflection coil AS with the return capacitor C R. With the diode D2 and the capacitor C2, a DC voltage is obtained from the return pulses present on the deflection coil AS, which serves on the one hand as a voltage U G2 for the second grid of the cathode ray tube and on the other hand via the resistor R as a voltage U to the control amplifier OP The height of the recovery pulses at the deflection coil AS corresponds to the image width of the image displayed with the cathode ray tube. Correspondingly, the voltage U at the control amplifier OP is the actual value of the image width and the control voltage U R is obtained in the control amplifier from the comparison with the reference voltage U Ref . From this it can be seen that a closed control loop is present for the bit width stabilization. The further voltages Uv, U, and U T applied to the control amplifier OP control the horizontal deflection in such a way that a constant image width is maintained
Um für den Transistor T2 eine einfache Type verwenden zu können, ist an den Fußpunkt A mit ihrer Anode eine Diode D3 angeschaltet, deren Kathode mit einer positiven Spannung +UB verbunden ist. Diese positive Spannung+UB kann beispielsweise 17 Volt betragen. Wenn nun durch einen Fehler im Oszillator G oder durch einen Fehler in den mit dem Fußpunkt A verbundenen Bauteilen die Spannung am Fußpunkt A über die an der Kathode der Diode D3 liegenden pösitiven Spannung plus der Durchlaßspannung der Diode D3 ansteigt, dann wird die Diode D3 leitend und bewahrt damit den Transistor T2 und den Kondensator C1 vor einer unzulässig hohen Spannung.In order to be able to use a simple type for the transistor T2, a diode D3 is connected to the base point A with its anode, the cathode of which is connected to a positive voltage + U B. This positive voltage + U B can be, for example, 17 volts. If, due to a fault in the oscillator G or a fault in the components connected to the base point A, the voltage at the base point A rises above the positive voltage present at the cathode of the diode D3 plus the forward voltage of the diode D3, then the diode D3 becomes conductive and thus protects the transistor T2 and the capacitor C1 from an impermissibly high voltage.
Claims (5)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3510138 | 1985-03-21 | ||
| DE19853510138 DE3510138A1 (en) | 1985-03-21 | 1985-03-21 | HORIZONTAL DISTRIBUTION |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0195392A2 true EP0195392A2 (en) | 1986-09-24 |
| EP0195392A3 EP0195392A3 (en) | 1988-11-02 |
| EP0195392B1 EP0195392B1 (en) | 1992-07-22 |
Family
ID=6265841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86103513A Expired - Lifetime EP0195392B1 (en) | 1985-03-21 | 1986-03-15 | Horizontal deflection circuit |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4651063A (en) |
| EP (1) | EP0195392B1 (en) |
| JP (1) | JPS61219267A (en) |
| DE (2) | DE3510138A1 (en) |
| DK (1) | DK127886A (en) |
| ES (1) | ES8703074A1 (en) |
| FI (1) | FI861042A (en) |
| NO (1) | NO860738L (en) |
| PT (1) | PT82211B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0530809A1 (en) * | 1991-09-06 | 1993-03-10 | Sony Corporation | Deflection current generating circuits |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8601347A (en) * | 1986-05-27 | 1987-12-16 | Philips Nv | LINE DEFLECTION IN AN IMAGE DISPLAY. |
| DE3743601C3 (en) * | 1986-12-31 | 1995-04-20 | Gold Star Co | High voltage stabilization circuit for overheating protection |
| GB9218735D0 (en) * | 1992-09-04 | 1992-10-21 | Thomson Consumer Electronics | Horizontal deflection waveform correction circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2228194A1 (en) * | 1971-06-09 | 1972-12-21 | Sony Corp | Voltage regulating circuit |
| US4282460A (en) * | 1979-11-19 | 1981-08-04 | Rca Corporation | Deflection and power supply circuit with reduced start-up drive |
| US4298829A (en) * | 1980-02-08 | 1981-11-03 | Rca Corporation | Power supply and deflection circuit with raster size compensation |
| JPS58196768A (en) * | 1982-05-11 | 1983-11-16 | Nec Corp | Horizontal deflecting circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5419324A (en) * | 1977-07-14 | 1979-02-14 | Sony Corp | Current control circuit |
| US4329729A (en) * | 1980-06-23 | 1982-05-11 | Rca Corporation | Side pincushion modulator circuit with overstress protection |
-
1985
- 1985-03-21 DE DE19853510138 patent/DE3510138A1/en not_active Withdrawn
-
1986
- 1986-02-28 NO NO860738A patent/NO860738L/en unknown
- 1986-03-07 US US06/837,545 patent/US4651063A/en not_active Expired - Lifetime
- 1986-03-13 FI FI861042A patent/FI861042A/en not_active Application Discontinuation
- 1986-03-15 EP EP86103513A patent/EP0195392B1/en not_active Expired - Lifetime
- 1986-03-15 DE DE8686103513T patent/DE3686072D1/en not_active Expired - Lifetime
- 1986-03-17 PT PT82211A patent/PT82211B/en not_active IP Right Cessation
- 1986-03-20 JP JP61061001A patent/JPS61219267A/en active Pending
- 1986-03-20 DK DK127886A patent/DK127886A/en not_active Application Discontinuation
- 1986-03-21 ES ES553239A patent/ES8703074A1/en not_active Expired
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2228194A1 (en) * | 1971-06-09 | 1972-12-21 | Sony Corp | Voltage regulating circuit |
| US4282460A (en) * | 1979-11-19 | 1981-08-04 | Rca Corporation | Deflection and power supply circuit with reduced start-up drive |
| US4298829A (en) * | 1980-02-08 | 1981-11-03 | Rca Corporation | Power supply and deflection circuit with raster size compensation |
| JPS58196768A (en) * | 1982-05-11 | 1983-11-16 | Nec Corp | Horizontal deflecting circuit |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACT OF JAPAN, Band 8, Nr. 39 (E-228)[1476], 21. Februar 1984; & JP - A - 58 196 768 (NIPPON DENKI K.K.) 16.11.1983 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0530809A1 (en) * | 1991-09-06 | 1993-03-10 | Sony Corporation | Deflection current generating circuits |
| US5285133A (en) * | 1991-09-06 | 1994-02-08 | Sony Corporation | Deflection current generating circuits |
Also Published As
| Publication number | Publication date |
|---|---|
| PT82211A (en) | 1986-04-01 |
| DK127886D0 (en) | 1986-03-20 |
| ES553239A0 (en) | 1987-01-16 |
| DE3686072D1 (en) | 1992-08-27 |
| US4651063A (en) | 1987-03-17 |
| FI861042A (en) | 1986-09-22 |
| DE3510138A1 (en) | 1986-09-25 |
| PT82211B (en) | 1992-05-29 |
| EP0195392B1 (en) | 1992-07-22 |
| EP0195392A3 (en) | 1988-11-02 |
| NO860738L (en) | 1986-09-22 |
| DK127886A (en) | 1986-09-22 |
| JPS61219267A (en) | 1986-09-29 |
| ES8703074A1 (en) | 1987-01-16 |
| FI861042A0 (en) | 1986-03-13 |
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